Outdoor unit for air-conditioning apparatus

ABSTRACT

An outdoor unit for an air-conditioning apparatus has a roof part installed at a front of a front panel of a casing and above an opening hole and extending in a width direction of the casing, and an outlet grille fixed to the casing and covering the opening hole. The roof part has a main roof portion that extends further forward than the front panel, and a sub-roof portion that extends downward and forward from the main roof portion and has a recession formed between a bottom face of the main roof portion and the sub-roof portion. The outlet grille is located such that an upper end portion of the outlet grille is in contact with the recession. The front panel and the upper end portion of the outlet grille sandwich the roof part.

TECHNICAL FIELD

The present disclosure relates to an outdoor unit for anair-conditioning apparatus that has a fan.

BACKGROUND ART

An outdoor unit for an air-conditioning apparatus has a casing in whicha fan is installed that drives and thus causes outdoor air to passthrough an opening hole opened in a side panel of the casing and to thencirculate. To the casing, an outlet grille or a fan guard, hereinafter,referred to as an outlet grille and other barrier, is attached to coverthe opening hole for safety. While the air-conditioning apparatus isoperating, drops of water on the surface of the side panel, which arecaused by rain, snow, or other factor, flow down along the surface of afront panel. Also, snow accumulated on a top plate melts into drops ofwater, which then flow down along the surfaces of the top plate and theside panel. As described above, drops of water flow down along thecasing and, when the drops of water reach the opening hole, flow throughbetween the fan and the edge of the opening hole. In a case in which theoutdoor air temperature is low, the drops of water flowing throughbetween the fan and the edge of the opening hole freeze into ice. Then,in a case in which the amount of the drops of water flowing throughbetween the fan and the edge of the opening hole is large, the resultantice may interfere with a rotation of the fan.

To solve this problem, an outdoor unit has been proposed in which abracket part that serves as a roof part is attached to above an openinghole and above an outlet grille and other barrier, which is alsoreferred as a fan guard, to prevent drops of water that flow down alongthe surface of a side panel from flowing through the inside of the edgeof the opening hole (see, for example, Patent Literature 1).

CITATION LIST Patent Literature

Patent Literature 1. Japanese Unexamined Patent Application PublicationNo. 2012-102971

SUMMARY OF INVENTION Technical Problem

A configuration is described in Patent Literature 1 in which a bracketpart has a plate portion and a leg portion in which a through-hole isopened and the bracket part is attached to a casing by a screw thatpasses through the through-hole in the leg portion and a through-hole ina fan guard. For this reason, for an outdoor unit described in PatentLiterature 1, it is complicated to attach the bracket part, which servesas the roof part, to the casing because the position of the through-holein the bracket part and the position of the through-hole in the fanguard are required to correspond to a fixed position for the casing.

The present disclosure is made to solve such a problem described above,and an object of the present disclosure is to provide an outdoor unitfor an air-conditioning apparatus that requires easer work than doessome outdoor unit in prevention of water from flowing through betweenthe fan and the edge of the opening hole.

Solution to Problem

An outdoor unit for an air-conditioning apparatus according to anembodiment of the present disclosure has a casing that has a front panelin which an opening hole is opened, a fan provided to the casing andconfigured to blow out air to an outside through the opening hole, aroof part installed at a front of the front panel and above the openinghole and extending in a width direction of the casing, and an outletgrille fixed to the casing and covering the opening hole. The roof parthas a main roof portion that extends further forward than the frontpanel, and a sub-roof portion that extends downward and forward from themain roof portion and has a recession formed between a bottom face ofthe main roof portion and the sub-roof portion. The outlet grille islocated such that an upper end portion of the outlet grille is incontact with the recession. The front panel and the upper end portion ofthe outlet grille hold the roof part such that the front panel and theupper end portion of the outlet grille sandwich the roof part.

Advantageous Effects of Invention

In an outdoor unit for an air-conditioning apparatus according to anembodiment of the present disclosure, in a state in which the outletgrille is fixed to the casing, the roof part is installed above theopening hole in the front panel such that the roof part is sandwiched bythe front panel and the upper end portion of the outlet grille, which isin contact with a portion of the roof part located between the main roofportion and the sub-roof portion. Unlike some outdoor unit in which theposition of the through-hole in the roof part and the position of thethrough-hole in the fan guard are required to correspond to a fixedposition for the casing, positioning with such high accuracy is thus notrequired. An outdoor unit according to an embodiment of the presentdisclosure therefore requires easer work than does some outdoor unit inprevention of water from flowing through between the fan and the edge ofthe opening hole.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a front perspective view that illustrates an outdoor unitaccording to Embodiment 1.

FIG. 2 is an exploded perspective view that illustrates the outdoor unitillustrated in FIG. 1 .

FIG. 3 is a front view that illustrates the outdoor unit illustrated inFIG. 1 .

FIG. 4 is a sectional view that illustrates the outdoor unit taken alongline I-I illustrated in FIG. 3 .

FIG. 5 is a perspective view that illustrates a roof part of the outdoorunit illustrated in FIG. 2 , and the roof part is viewed from the frontright.

FIG. 6 is a perspective view that illustrates the roof part of theoutdoor unit illustrated in FIG. 2 , and the roof part is viewed fromabove.

FIG. 7 is a perspective view that illustrates a schematic configurationof the roof part illustrated in FIG. 6 , and the roof part is viewed inthe direction of an arrow A illustrated in FIG. 6 .

FIG. 8 is a side view that illustrates the schematic configuration ofthe roof part illustrated in FIG. 6 , and the roof part is viewed in thedirection of an arrow B illustrated in FIG. 6 .

FIG. 9 is a perspective view that illustrates a schematic configurationof an outlet grille of the outdoor unit illustrated in FIG. 2 .

FIG. 10 is an exploded perspective view that illustrates a state beforethe outlet grille and the roof part in the outdoor unit illustrated inFIG. 1 are assembled with each other.

FIG. 11 is a perspective view that illustrates a state after the outletgrille and the roof part in the outdoor unit illustrated in FIG. 1 areassembled with each other, and the outlet grille and the roof part areviewed in the direction of an arrow C illustrated in FIG. 10 .

FIG. 12 is a perspective view that illustrates a positional relationbetween a front panel and the outlet grille in the outdoor unitillustrated in FIG. 1 .

FIG. 13 is a sectional view that illustrates the outdoor unit takenalong line Ill-Ill illustrated in FIG. 3 in a state after the frontpanel and the outlet grille illustrated in FIG. 12 are attached.

FIG. 14 is a sectional view that illustrates the outdoor unit takenalong line II-II illustrated in FIG. 3 .

FIG. 15 is a partially-enlarged view that illustrates a positionalrelation between a top plate, the outlet grille, and the roof part inthe outdoor unit illustrated in FIG. 14 .

FIG. 16 is a partially-enlarged view that illustrates a positionalrelation between the front panel and the roof part in the outdoor unitillustrated in FIG. 3 .

FIG. 17 is a perspective view that illustrates a modification of theroof part according to Embodiment 1.

DESCRIPTION OF EMBODIMENT Embodiment 1

FIG. 1 is a front perspective view that illustrates an outdoor unitaccording to Embodiment 1, An outdoor unit for an air-conditioningapparatus, hereinafter, referred to as an outdoor unit 100, is connectedto an unillustrated indoor unit by a connection pipe and thus forms arefrigeration cycle. Hereinafter, the outdoor unit 100 is described withreference to the drawings and with an example case in which the outdoorunit 100 is installed on the floor of air-conditioning target space. Inthe drawings, the direction of an arrow X indicates a width direction ofthe outdoor unit 100, the direction of an arrow Y indicates a front-reardirection of the outdoor unit 100, and the direction of an arrow Zindicates a height direction of the outdoor unit 100.

The present disclosure is not limited to any forms illustrated in thedrawings described below. Further, in following description, directionalterms, such as “upper”, “lower”, “right”, “left”, “front”, and “rear”,used as appropriate for ease of comprehension are merely forexplanation, and the present disclosure is not limited by suchdirectional terms. These directional terms are each referred to as adirection in a case in which the outdoor unit 100 is viewed from thefront unless other specific description is provided. Further, elementsgiven identical reference signs in each drawing are identical orequivalent elements, and these reference signs are common throughout thewhole description of the specification.

The outdoor unit 100 has a casing 100 a, which is a shell of the outdoorunit 100. The casing 100 a includes a front panel 1, side panels 2, atop plate 3, and a base 4. The side panels 2 each serve as a side faceof the casing 100 a, the front panel 1 serves as the front face of thecasing 100 a, the top plate 3 serves as the top face of the casing 100a, and the base 4 serves as the bottom face of the casing 100 a. Thefront panel 1 has an opening hole 1 a, which is substantiallycircular-shaped, passes through the inside and the outside of the casing100 a, and serves as an air outlet.

FIG. 2 is an exploded perspective view that illustrates the outdoor unitillustrated in FIG. 1 . As illustrated in FIG. 2 , the outdoor unit 100has an outlet grille 6 and a roof part 7. The outlet grille 6 preventsthe fingers of people from entering the opening hole 1 a. The roof part7 prevents water caused by rain, snow, or other factor from flowingthrough the opening hole 1 a. The outlet grille 6 includes a pluralityof iron bars or other parts and is located at the front of the frontpanel 1 such that the outlet grille 6 covers the opening hole 1 a. Theroof part 7 includes a metal sheet or other part that extends in thewidth direction of the outdoor unit 100, which is also referred to asthe direction of the arrow X. The roof part 7 is located at the front ofthe front panel 1 and above the opening hole 1 a.

The front panel 1 has a bell mouth 1 b, which protrudes from the edge ofthe opening hole 1 a in the front panel 1 rearward and toward the centerof the opening hole 1 a. The front panel 1 also has screw holes 1 c andinsertion holes 11, which are opened around the outer circumference ofthe opening hole 1 a and through which the outlet grille 6 is attached.The screw holes 1 c are opened at the respective left and right portionsbelow the outer circumference of the opening hole 1 a in the front panel1. The insertion holes 11 are opened at the respective left and rightportions above the outer circumference.

The outlet grille 6 has grille extension portions 62 and fixationportions 63. The grille extension portions 62 are located at upperportions of the outlet grille 6 and extend upward. The fixation portions63 are located at lower portions of the outlet grille 6 and haverespective screw holes 63 a, The grille extension portions 62 of theoutlet grille 6 are inserted into the insertion holes 11 in the frontpanel 1, fixing screws 9 are fixed to the front panel 1 through thescrew holes 63 a of the fixation portions 63 of the outlet grille 6 andthe screw holes 1 c in the front panel 1, and the outlet grille 6 isthus fixed to the front panel 1.

FIG. 3 is a front view that illustrates the outdoor unit illustrated inFIG. 1 . FIG. 4 is a sectional view that illustrates the outdoor unittaken along line I-I illustrated in FIG. 3 . An internal configurationof the outdoor unit 100 is described below with reference to FIG. 2 andFIG. 4 .

The outdoor unit 100 also has other components such as a compressor 16,a heat exchanger 13, an air-sending device 15, and a controller 8. Thecompressor 16 compresses refrigerant. The heat exchanger 13 allowsrefrigerant and air to exchange heat with each other. The air-sendingdevice 15 sends air to the heat exchanger 13. In addition, asillustrated in FIG. 4 , the outdoor unit 100 also has a partition plate10 and a support portion 14. The partition plate 10 partitions theinside of the casing 100 a into two spaces. The support portion 14supports the air-sending device 15.

The compressor 16 sucks refrigerant, compresses the refrigerant intohigh temperature and high pressure. The compressor 16 is, for example,an inverter compressor that has a controllable capacity. The heatexchanger 13 is, for example, a fin-and-tube heat exchanger. Asillustrated in FIG. 4 , the air-sending device 15 has a fan 15 a, whichhas a plurality of blades, and a motor 15 b, which rotates and thusdrives the fan 15 a. The air-sending device 15 generates, by a rotationof the fan 15 a, an airflow that passes through the heat exchanger 13.The support portion 14 is attached to the base 4 and the heat exchanger13. The support portion 14 supports the motor 15 b such that therotational face of the fan 15 a faces the opening hole 1 a in the frontpanel 1 in the height direction, which is also referred to as thedirection of the arrow Z, and the width direction, which is alsoreferred to as the direction of the arrow X. In an example illustratedin FIG. 2 and FIG. 4 , the air-sending device 15 is installed at theleft inside the casing 100 a by use of the support portion 14 and thecompressor 16 is installed at the right inside the casing 100 a.

In the example illustrated in FIG. 2 and FIG. 4 , the heat exchanger 13is L-shaped in plan view and serves as the left portion of the rear faceof the casing 100 a and the rear portion of the left side face of thecasing 100 a. Also in the example illustrated in FIG. 2 and FIG. 4 , aside panel 2 a of the side panels 2 on the right serves as the rightface of the casing 100 a and the right portion of the rear face of thecasing 100 a. On the other hand, a side panel 2 b of the side panels 2on the left serves as the left face of the casing 100 a. The side panel2 b on the left has a plurality of opening ports.

As illustrated in FIG. 2 , the controller 8 includes components such asa plurality of electric parts and controls the refrigeration cycle.Specifically, the controller 8 controls the frequency of the compressor16 and the rotation frequency of the air-sending device 15. Thecompressor 16 is fixed to the base 4 and the controller 8 is locatedabove the compressor 16.

As illustrated in FIG. 4 , the partition plate 10 is installed on thebase 4 of the casing 100 a and partitions the inside of the casing 100 ainto a machine chamber M and an air-sending chamber F. The machinechamber M houses components such as the compressor 16 and theair-sending chamber F houses components such as the air-sending device15. In the machine chamber M, components such as an unillustratedrefrigerant pipe and the controller 8 illustrated in FIG. 2 areprovided. In the air-sending chamber F, components such as the heatexchanger 13 and the support portion 14 are located.

When the air-sending device 15 is driven and the fan 15 a thus rotates,air is sucked into the casing 100 a through the plurality of openingports opened in the side panel 2 b and the heat exchanger 13 and guidedout from the opening hole 1 a along the bell mouth 1 b formed in thefront panel 1.

FIG. 5 is a perspective view that illustrates the roof part of theoutdoor unit illustrated in FIG. 2 , and the roof part is viewed fromthe front right. FIG. 6 is a perspective view that illustrates the roofpart of the outdoor unit illustrated in FIG. 2 , and the roof part isviewed from above. FIG. 7 is a perspective view that illustrates aschematic configuration of the roof part illustrated in FIG. 6 , and theroof part is viewed in the direction of an arrow A illustrated in FIG. 6. FIG. 8 is a side view that illustrates the schematic configuration ofthe roof part illustrated in FIG. 6 , and the roof part is viewed in thedirection of an arrow B illustrated in FIG. 6 . The structure of theroof part 7 is described below with reference to FIG. 5 to FIG. 8 .

As illustrated in FIG. 5 , the roof part 7 has a main roof portion 71and a sub-roof portion 72. The main roof portion 71 is belt-shaped. Thesub-roof portion 72 is located below the main roof portion 71. Asillustrated in FIG. 2 and FIG. 3 , the main roof portion 71 has thehorizontal width, which is larger than or equal to a diameter Do, whichis illustrated in FIG. 2 , of the opening hole 1 a in the front panel 1.The roof part 7 is installed in the front panel 1 such that thelongitudinal direction of the roof part 7 coincides with the widthdirection of the casing 100 a, which is also referred to as thedirection of the arrow X. Hereinafter, the longitudinal direction of theroof part 7 may be also referred to as a horizontal width direction.

As illustrated in FIG. 5 , the sub-roof portion 72 extends downward andforward from the main roof portion 71. The sub-roof portion 72 forms,together with a bottom face 71 b of the main roof portion 71 illustratedin FIG. 8 , recessions 7 a, In Embodiment 1, as illustrated in FIG. 7 ,the sub-roof portion 72 has a configuration in which the sub-roofportion 72 extends downward and forward from a tail end 71 e of the mainroof portion 71. The configuration described above in which the sub-roofportion 72 extends downward and forward from the main roof portion 71is, more specifically, as illustrated in FIG. 8 , a configuration inwhich the sub-roof portion 72 is inclined from the main roof portion 71such that the sub-roof portion 72 is further away from the bottom face71 b of the main roof portion 71 further toward an distal end of thesub-roof portion 72. The sub-roof portion 72 is only required to belocated such that the recessions 7 a are formed between the bottom face71 b of the main roof portion 71 and the sub-roof portion 72. Thesub-roof portion 72 may be located between a front end 71 f and the tailend 71 e in the bottom face 71 b of the main roof portion 71.

In an example illustrated in FIG. 5 , the sub-roof portion 72 are threeprotrusions provided in the longitudinal direction of the main roofportion 71, which is also referred to as the direction of the arrow X. Afirst protrusion 72 b is provided to the central portion in thelongitudinal direction of the main roof portion 71, which is alsoreferred to as the direction of the arrow X. Second protrusions 72 a areprovided at both respective sides of the central portion of the mainroof portion 71. The numbers of protrusions in the sub-roof portion 72is not limited to three. For example, the sub-roof portion 72 may be onefirst protrusion 72 b, two second protrusions 72 a, or four or moreprotrusions.

The roof part 7 also has extension ribs 73 and a front-end protrusion74. The extension ribs 73 each extend from the tail end 71 e of the mainroof portion 71. The front-end protrusion 74 is located at the front end71 f of the main roof portion 71 and is shaped such that the front-endprotrusion 74 protrudes upward. The roof part 7 also has tail-endprotrusions 75 provided at the tail end 71 e of the main roof portion 71and shaped such that the tail-end protrusions 75 each protrude downward.

The extension ribs 73 are each located such that the extension ribs 73are each continuous with the tail end 71 e of the main roof portion 71and the top face of each of the extension ribs 73 and a top face 71 a ofthe main roof portion 71 form a continuous flat surface, the exampleillustrated in FIG. 5 , the extension ribs 73 are located at tworespective left and right portions of the main roof portion 71 such thatthe extension ribs 73 correspond to the respective locations of thesecond protrusions 72 a. Between the extension ribs 73, a gap is left.The extension ribs 73 each has a distal end portion, which iscurved-shaped such that the distal end portion is narrower in shape asthe distal end portion is further away from the main roof portion 71.The number of the extension ribs 73 and the positions in which theextension ribs 73 are located are not limited to those described above.

The front-end protrusion 74 is located such that the front-endprotrusion 74 has substantially the same length as the main roof portion71 in the longitudinal direction of the roof part 7, which is alsoreferred to as the direction of the arrow X. The tail-end protrusions 75are preferably located such that, as illustrated in FIG. 7 , in thelongitudinal direction of the main roof portion 71, which is alsoreferred to as the direction of the arrow X, no tail-end protrusion 75is provided at the central portion at which the first protrusion 72 b islocated and the tail-end protrusions 75 are located at respective leftand right sides of the central portion. The tail-end protrusions 75 areeach located as described above and the minimum possible space is thusrequired at a portion in which the roof part 7 is installed above theuppermost portion of the opening hole 1 a in the front panel 1illustrated in FIG. 1 . The tail-end protrusions 75 may also be omitted.

The roof part 7 also has, as illustrated in FIG. 7 , notches 7 b andregulation ribs 76. The notches 7 b are located at respective left andright portions in the longitudinal direction of the main roof portion71, which is also referred to as the direction of the arrow X. Theregulation ribs 76 are located in the bottom face 71 b of the main roofportion 71 and at portions next to the respective outside edges of thenotches 7 b. The notches 7 b are each provided by cutting thecorresponding one of the tail-end protrusions 75 and the tail end of themain roof portion 71. To the notches 7 b, the grille extension portions62 illustrated in FIG. 2 are attached. The notches 7 b and theregulation ribs 76 are used to position the roof part 7 and the outletgrille 6 illustrated in FIG. 2 , which are being assembled with eachother, in fixed positions. The grille extension portions 62 areregulated in movement in their longitudinal direction and in theirforward direction by the inner walls of the notches 7 b. The grilleextension portions 62 are also regulated in outward movement in theirlongitudinal direction by the regulation ribs 76.

FIG. 9 is a perspective view that illustrates a schematic configurationof the outlet grille of the outdoor unit illustrated in FIG. 2 . Thestructure of the outlet grille 6 is described below with reference toFIG. 9 . The grille extension portions 62 described above are located atupper portions of the outlet grille 6 and extend rearward. The fixationportions 63 described above are located at lower portions of the outletgrille 6.

The outlet grille 6 is a plurality of iron bars 60, such as a pluralityof vertical bars 60 a and a plurality of horizontal bars 60 b. Theplurality of vertical bars 60 a are arranged in the horizontaldirection, which is also referred to as the direction of the arrow X.The plurality of horizontal bars 60 b intersect the plurality ofvertical bars 60 a and are arranged in the vertical direction, which isalso referred to as the direction of the arrow Z. The plurality ofvertical bars 60 a and the plurality of horizontal bars 60 b are joinedwith each other by welding or other method. The outlet grille 6 also hasa grille body 61 obtained by joining the plurality of iron bars 60 witheach other such that the grille body 61 is, for example, grid-shaped.The grille extension portions 62 described above are located atrespective left and right upper ends of the grille body 61. The fixationportions 63 described above are located at respective left and rightlower ends of the grille body 61.

The grille body 61 is square-shaped as a whole. The plurality ofvertical bars 60 a each have the upper end and the lower end, which areeach bent rearward. The plurality of horizontal bars 60 b each have theleft end and the right end, which are also each bent rearward. Infollowing description, the upper end of the grille body 61, which arethe upper ends of the plurality of vertical bars 60 a, may be alsoreferred to as an upper end portion 6 a of the outlet grille 6. Theupper end portion 6 a of the outlet grille 6 extends rearward andupward.

The grille extension portions 62 each extend further rearward than theupper end portion 6 a of the grille body 61. As illustrated in FIG. 2 ,when the outlet grille 6 is attached to the front panel 1, the grilleextension portions 62 are inserted into the respective insertion holes11 in the front panel 1 and are hung on the front panel 1. Asillustrated in FIG. 9 , the grille extension portions 62 are each, forexample, one of the upper ends of the plurality of iron bars 60 includedas the grille body 61. The grille extension portions 62 each have aproximal portion 62 a and an insertion distal portion 62 b. The proximalportions 62 a each extend rearward and upward from the upper end portion6 a of the grille body 61. The insertion distal portions 62 b are eachlocated at the rear end of the corresponding one of the proximalportions 62 a and extend upward.

The fixation portions 63 located at a lower portion of the grille body61 are each located further rearward than the lower end of the grillebody 61. The fixation portions 63 are each located further forward thanthe insertion distal portions 62 b of the grille extension portions 62in the front-rear direction, which is also referred to as the directionof the arrow Y. The fixation portions 63 are each, for example, one ofthe lower ends of the plurality of iron bars 60 included as the grillebody 61. The screw holes 63 a are each obtained by bending the one ofthe lower ends of the plurality of iron bars 60 into a circular shape.

FIG. 10 is an exploded perspective view that illustrates a state beforethe outlet grille and the roof part in the outdoor unit illustrated inFIG. 1 are assembled with each other. FIG. 11 is a perspective view thatillustrates a state after the outlet grille and the roof part in theoutdoor unit illustrated in FIG. 1 are assembled with each other, andthe outlet grille and the roof part are viewed in the direction of anarrow C illustrated in FIG. 10 . Before the outlet grille 6 is attachedto the outdoor unit 100 as illustrated in FIG. 1 , the outlet grille 6and the roof part 7 are assembled with each other as illustrated in FIG.10 . A procedure to assemble the outlet grille 6 and the roof part 7with each other is described below with reference to FIG. 10 and FIG. 11.

Into the notches 7 b cut in the roof part 7, the respective grilleextension portions 62 of the outlet grille 6 are inserted from below. Ina state in which the grille extension portions 62 are inserted into therespective notches 7 b, the roof part 7 is attached to the outlet grille6 in an attachment direction indicated by a white arrow illustrated inFIG. 10 . At this time, the upper end portion 6 a of the outlet grille 6is fitted into the recessions 7 a formed between the main roof portion71 and the sub-roof portion 72 illustrated in FIG. 7 , With thisprocedure, the upper ends of the plurality of vertical bars 60 a thatare the upper end portion 6 a of the grille body 61 are held such thatthe upper ends of the plurality of vertical bars 60 a are sandwiched bythe main roof portion 71 and the protrusions that are the sub-roofportion 72, which are the first protrusion 72 b and the secondprotrusions 72 a.

When the roof part 7 is attached to the outlet grille 6, the grilleextension portions 62 are in contact with the two respective notches 7 band the two respective regulation ribs 76 located in the roof part 7,and the roof part 7 is thus prevented from moving from the outlet grille6 in the left-right direction, which is also referred to as thedirection of the arrow X. With this procedure, the roof part 7 isattached to the outlet grille 6 in a predetermined position in thehorizontal direction.

FIG. 12 is a perspective view that illustrates a positional relationbetween the front panel and the outlet grille in the outdoor unitillustrated in FIG. 1 . FIG. 13 is a sectional view that illustrates theoutdoor unit taken along line III-III illustrated in FIG. 3 in a stateafter the front panel and the outlet grille illustrated in FIG. 12 areattached.

As illustrated in FIG. 12 , the insertion holes 11 are eachsubstantially U-shaped. As illustrated in FIG. 13 , the front panel 1has insertion spaces 12 above the insertion holes 11 and further insidethan the insertion holes 11, in which the insertion distal portions 62 bof the grille extension portions 62 are located. The insertion spaces 12communicate with the respective insertion holes 11. Rear walls 11 a ofthe insertion holes 11 are connected to respective rear walls 12 a ofthe insertion spaces 12. The rear walls 11 a of the insertion holes 11and the rear walls 12 a of the insertion spaces 12 are substantiallyparallel to the surface of the front panel 1. Side walls 11 b, whichconnect the surface of the front panel 1 and the rear walls 11 a of theinsertion holes 11, are located at lower portions of the insertion holes11. The side walls 11 b are each taper-shaped such that the side wall 11b is further inclined upward as the side wall 11 b is further rearward.The side walls 11 b at the lower portions of the insertion holes 11, therear walls 11 a of the insertion holes 11, and the rear walls 12 a ofthe insertion spaces 12 are used to guide the grille extension portions62 inserted into the insertion holes 11 to the insertion spaces 12.

FIG. 14 is a sectional view that illustrates the outdoor unit takenalong line II-Il illustrated in FIG. 3 . A procedure to attach theoutlet grille 6 to the front panel 1 is described below with referenceto FIG. 13 and FIG. 14 . As Illustrated in FIG. 13 , the insertiondistal portions 62 b of the grille extension portions 62 are insertedinto the insertion holes 11, which are opened at portions above theouter circumference of the opening hole 1 a in the front panel 1, andthe insertion distal portions 62 b are thus located in the insertionspaces 12 in the front panel 1. With this procedure, the grilleextension portions 62 are hung on the front panel 1. When the insertiondistal portions 62 b are inserted into the insertion holes 11, theinsertion distal portions 62 b are guided to the insertion spaces 12,which are located above the insertion holes 11 and further inside thanthe insertion holes 11, while the angles of the insertion distalportions 62 b are being changed by the side walls 11 b and the rearwalls 11 a of the insertion holes 11 and the rear walls 12 a of theinsertion spaces 12. The insertion distal portions 62 b are thus locatedin the insertion spaces 12 such that the insertion distal portions 62 bare substantially parallel to the surface of the front panel 1.

While the insertion distal portions 62 b are being inserted from theinsertion holes 11 to the further inside, the angle of the outlet grille6 to the front panel 1 is changed. As illustrated in FIG. 14 , the lowerportion of the outlet grille 6 thus moves closer to the front panel 1.As illustrated in FIG. 13 , when the insertion distal portions 62 b ofthe grille extension portions 62 are fully inserted into the insertionholes 11, the proximal portions 62 a of the grille extension portions 62are in contact with edge portions 11 c of the insertion holes 11 and theinsertion distal portions 62 b stops moving upward. In this state, thefront panel 1 and the outlet grille 6 are positioned. When the frontpanel 1 and the outlet grille 6 are positioned, as illustrated in FIG.14 , the screw holes 63 a located at the fixation portions 63 of theoutlet grille 6, which are illustrated in FIG. 9 , and the screw holes 1c in the front panel 1, which are illustrated in FIG. 2 , coincide witheach other in the front-rear direction of the casing 100 a, which isalso referred to as the direction of the arrow Y. The fixing screws 9are inserted and fixed into the screw holes 63 a of the fixationportions 63 and the screw holes 1 c in the front panel 1, and the outletgrille 6 is thus fixed to the front panel 1.

FIG. 15 is a partially-enlarged view that illustrates a positionalrelation between the top plate, the outlet grille, and the roof part inthe outdoor unit illustrated in FIG. 14 . The outlet grille 6 is fixedto the front panel 1 as illustrated in FIG. 14 , the roof part 7attached to the outlet grille 6 is thus sandwiched by the front panel 1and the outlet grille 6 and the roof part 7 is hence fixed to the frontpanel 1 as illustrated in FIG. 15 . In a state in which the outletgrille 6 is fixed to the front panel 1, the main roof portion 71 isinclined downward along the upper end portion 6 a of the outlet grille6, which are bent. Also in this state, the main roof portion 71 islocated such that the main roof portion 71 is inclined further downwardas the main roof portion 71 is further away from the front panel 1.

Specifically, when the outlet grille 6 is fixed to the front panel 1,the grille extension portions 62 are supported by the front panel 1 andforce is applied rearward to the roof part 7 from the upper end portion6 a of the outlet grille 6 through the recessions 7 a This force thuspresses the extension ribs 73, which are located at portions of the tailend 71 e of the main roof portion 71, against the front panel 1. At thesame time, a stress is applied forward to the extension ribs 73 from thefront panel 1. In other words, when the outlet grille 6 is fixed to thefront panel 1, the roof part 7 is held such that the roof part 7 issandwiched by the front panel 1 and the outlet grille 6.

With this configuration, a fastening part, such a screw, is not used tofasten the roof part 7, and easer work is required to attach the roofpart 7. In addition, since a fastening part is not used to fasten theroof part 7, which is used for drainage, the same configuration of thefront panel 1 may be used for products to be shipped to cold regions, inwhich water is easily frozen, and products to be shipped to temperateregions, which are different from cold regions. Product management isthus facilitated.

Alternatively, a configuration may also be used in which no extensionribs 73 are provided to the roof part 7 and the tail end 71 e of themain roof portion 71 is in contact with the front panel 1. In this case,in a state in which the outlet grille 6 is fixed to the front panel 1,the length of the proximal portions 62 a of the grille extensionportions 62 is only required to be specified with which the tail end 71e of the main roof portion 71 is pressed against the front panel 1.

However, in a case in which the extension ribs 73 are provided, incomparison with a case in which no extension ribs 73 are provided,pressure applied to a location at which the roof part 7 and the frontpanel 1 are in contact with each other is larger and the roof part 7 ismore stably held such that the roof part 7 is thus further pressedagainst the front panel 1. While an air-conditioning apparatus isoperating, components such as the compressor 16 and the air-sendingdevice 15, which are illustrated in FIG. 4 , drive and vibrations arethus produced at the outdoor unit 100. With the configuration in whichthe extension ribs 73 are provided and are pressed against the frontpanel 1, the outlet grille 6, which is the plurality of iron bars 60, iswarped and generates repulsion, which prevents the roof part 7 frombeing wobbled by vibrations and thus prevents a vibration sound producedby the roof part 7.

The structure of the top plate 3 is described below with reference toFIG. 15 . The top plate 3 has a top-plate extension portion 30, whichextends further forward than the front panel 1 in the front-reardirection, which is also referred to as the direction of the arrow Y.The top-plate extension portion 30 extends further forward than the tailend 71 e of the main roof portion 71. The top plate 3 covers the upperend of the front panel 1 and also covers a portion of the roof part 7that is in the vicinity of the front panel 1. The top-plate extensionportion 30 has a flange portion 31, which protrudes downward. In anexample illustrated in FIG. 15 , the length of the flange portion 31 isspecified with which a lower edge 31 a of the flange portion 31 and thetop face 71 a of the main roof portion 71 are in contact with eachother.

FIG. 16 is a partially-enlarged view that illustrates a positionalrelation between the front panel and the roof part in the outdoor unitillustrated in FIG. 3 . An arrow W1 illustrated in FIG. 15 indicates aflow of water along the top-plate extension portion 30. Arrows W2illustrated in FIG. 16 indicate flows of water at opposite respectiveends of the roof part 7 in the horizontal width direction, which is alsoreferred to as the direction of the arrow X.

As illustrated in FIG. 15 , water flows from an upper portion of thetop-plate extension portion 30 along the flange portion 31 and then, atthe lower edge 31 a of the flange portion 31, moves onto the top face 71a of the main roof portion 71 and toward the front end 71 f. Water thatflows along a front portion of the top plate 3 is thus prevented fromflowing around the lower edge 31 a of the flange portion 31 toward thefront panel 1. Water is hence prevented from flowing through the openinghole 1 a opened in the front panel 1.

Water having moved from the flange portion 31 onto the top face 71 a ofthe main roof portion 71 flows on the top face 71 a, which is inclineddownward, toward the front end 71 f. Water having reached the front end71 f of the main roof portion 71 is blocked by the front-end protrusion74 and is separated into the left and the right. The water then flows onthe top face 71 a of the main roof portion 71 along the front-endprotrusion 74 and is discharged, as illustrated in FIG. 16 , from bothopposite ends of the main roof portion 71 in the horizontal widthdirection, which is also referred to as the direction of the arrow X.

In a state in which the outlet grille 6 is fixed to the front panel 1 asillustrated in FIG. 14 , the length of the main roof portion 71 in thefront-rear direction, which is also referred to as the direction of thearrow Y, is also specified with which the front end 71 f of the mainroof portion 71 is located further forward than the sub-roof portion 72and the outlet grille 6. Even in a case in which water having reachedthe front end 71 f of the main roof portion 71 flows over the front-endprotrusion 74 and flows forward, the water merely drips from thefront-end protrusion 74. Water is therefore prevented from moving alongthe outlet grille 6 onto the front panel 1.

Also, as described above, the main roof portion 71 has the horizontalwidth, which is larger than or equal to the diameter Do of the openinghole 1 a in the front panel 1, and the main roof portion 71 is inclinedfurther downward as the main roof portion 71 is further away from thefront panel 1. Drops of water that are blocked by the front-endprotrusion 74 and flow separately in the left-right direction thus dripfrom the front portion of the main roof portion 71. Water dischargedfrom the roof part 7 is therefore prevented from flowing from theopposite ends of the roof part 7 along the outdoor unit 100. Inparticular, at the front face of the casing 100 a, water discharged fromthe roof part 7 is therefore prevented from flowing through the upperportion of the edge of the opening hole 1 a in the front panel 1 andinto the inside of the opening hole 1 a in the front panel 1. With thisconfiguration, water is also prevented from flowing through between thebell mouth 1 b and the fan 15 a illustrated in FIG. 4 . Even when theoutdoor air temperature is so low that water is frozen, such lessresultant ice is thus less likely to interfere with a rotation of thefan. Even when the outdoor air temperature is so low that thetemperature of air blown out from the fan 15 a is below freezing point,water located between the fan 15 a and the bell mouth 1 b and othercomponents is therefore prevented from being frozen. Such less resultantice is less likely to interfere with a rotation of the fan 15 a andextraordinary noise, which may be caused by such interference, is thusprevented from being generated.

Also, as illustrated in FIG. 15 , the top face 71 a of the main roofportion 71 and the lower edge 31 a of the flange portion 31 are incontact with each other at a location further forward than a bifurcationpoint Pd at which the sub-roof portion 72 branches from the main roofportion 71 in the front-rear direction, which is also referred to as thedirection of the arrow Y, Furthermore, the top face 71 a of the mainroof portion 71 and the lower edge 31 a of the flange portion 31 arepreferably in contact with each other at a location further forward thanthe bifurcation point Pd and further rearward than the front face of thegrille body 61 in the front-rear direction, which is also referred to asthe direction of the arrow Y.

With this configuration, the roof part 7 is sandwiched by the upper endportion 6 a of the outlet grille 6 and the front panel 1 in thefront-rear direction, which is also referred to as the direction of thearrow Y, the roof part. 7 is also sandwiched by the upper end portion 6a of the outlet grille 6 and the lower edge 31 a of the flange portion31 in the height direction, which is also referred to as the directionof the arrow Z, and the roof part 7 is therefore more stably held. Suchan event that the roof part 7 is wobbled, as described above, istherefore prevented and a vibration sound produced when the roof part 7is wobbled is also prevented.

FIG. 17 is a perspective view that illustrates a modification of theroof part according to Embodiment 1. As illustrated in FIG. 17 , themain roof portion 71 of the modification is inclined downward from acenter Pc, which is the center in the horizontal width direction, whichis also referred to as the direction of the arrow X, toward both endportions Pe, which are opposite to each other in the horizontal widthdirection, which is also referred to as the direction of the arrow X.Other components of the roof part 7 in the modification are the same asthe roof part 7 illustrated in FIG. 6 , and their description is thusomitted.

With this configuration, water that flows along the flange portion 31and moves onto the top face 71 a of the main roof portion 71 asillustrated in FIG. 15 is moved toward the left or right end portion Peand is sped up by gravity. The water is therefore prevented fromstagnating on the main roof portion 71 and the water on the roof part 7is thus discharged from at least either one of the end portions Pe withmore certainty.

In an example illustrated in FIG. 17 , the main roof portion 71 is bentat the center Pc in the horizontal width direction, which is alsoreferred to as the direction of the arrow X, portions on the left andright of the center Pc are thus each inclined. Alternatively, forexample, by varying the thickness of the main roof portion 71 in thehorizontal width direction, which is also referred to as the directionof the arrow X, portions on the left and right of the center Pc may beeach inclined. Specifically, portions on the left and right of thecenter Pc on the top face 71 a of the main roof portion 71 may be eachinclined such that the bottom face 71 b of the main roof portion 71 isflat and the thickness of the main roof portion 71 is gradually reducedfrom the center Pc in the horizontal width direction, which is alsoreferred to as the direction of the arrow X, toward each of the endportions Pe in the horizontal width direction, which is also referred toas the direction of the arrow X.

Also, when the main roof portion 71 is inclined downward from the centerPc in the horizontal width direction, which is also referred to as thedirection of the arrow X, toward both the end portions Pe in thehorizontal width direction, which is also referred to as the directionof the arrow X, a configuration may be used in which the main roofportion 71 is located horizontally in the front-rear direction, which isalso referred to as the direction of the arrow Y, and the front-endprotrusion 74 is omitted. In this configuration, the upper end portion 6a of the outlet grille 6 extends horizontally rearward and thus extendsalong the main roof portion 71.

As described above, the outdoor unit 100 for an air-conditioningapparatus according to Embodiment 1 has the casing 100 a, which has thefront panel 1 in which the opening hole 1 a is opened, the fan 15 aprovided to the casing 100 a and configured to blow out air to theoutside through the opening hole 1 a, the roof part 7, and the outletgrille 6. The roof part 7 is installed at the front of the front panel 1and above the opening hole 1 a and extends in the width direction of thecasing 100 a, which is also referred to as the direction of the arrow X.The outlet grille 6 is fixed to the casing 100 a and covers the openinghole 1 a. The roof part 7 has the main roof portion 71, which extendsfurther forward than the front panel 1, and the sub-roof portion 72,which extends downward and forward from the main roof portion 71 and hasthe recessions 7 a formed between the bottom face 71 b of the main roofportion 71 and the sub-roof portion 72. The outlet grille 6 has theupper end portion 6 a, which is in contact with the recessions 7 a. Thefront panel 1 and the upper end portion 6 a of the outlet grille 6 holdthe roof part 7 such that the front panel 1 and the upper end portion 6a of the outlet grille 6 sandwich the roof part 7.

With this configuration, water is discharged toward a location away fromthe opening hole 1 a through the roof part 7, which is in contact withthe front panel 1. Also, the upper end portion 6 a of the outlet grille6, which is located between the main roof portion 71 and the sub-roofportion 72, and the front panel 1 hold the roof part 7 in apredetermined position. To attach the roof part 7, the outdoor unit 100therefore requires easer work than does some outdoor unit in preventionof water from flowing through between the fan 15 a and the opening hole1 a in the front panel 1.

The casing 100 a also has the top plate 3 located on top of the frontpanel 1. The top plate 3 has the top-plate extension portion 30, whichextends further forward than the tail end 71 e of the main roof portion71 and covers a portion of the roof part 7 that is in the vicinity ofthe front panel 1. With this configuration, drops of water flow on thetop-plate extension portion 30 of the top plate 3 and then flow on aportion of the roof part 7 located further forward than a gap betweenthe roof part 7 and the front panel 1. Water is therefore prevented fromflowing, through the gap between the roof part 7 and the front panel 1,through the edge of the opening hole 1 a and into the inside of theopening hole 1 a.

Also, the top-plate extension portion 30 has the flange portion 31,which protrudes downward. The top face 71 a of the main roof portion 71and the lower edge 31 a of the flange portion 31 are in contact witheach other in a state in which the outlet grille 6 is fixed to thecasing 100 a. Water is thus prevented from flowing around rearward ofthe top-plate extension portion 30. Water is therefore prevented fromflowing through the edge of the opening hole 1 a and into the inside ofthe opening hole 1 a.

Also, in a state in which the outlet grille 6 is fixed to the casing 100a, the top face 71 a of the main roof portion 71 and the lower edge 31 aof the flange portion 31 are in contact with each other at a locationfurther forward than a location at which the sub-roof portion 72branches from the main roof portion 71. With this configuration, themain roof portion 71 is sandwiched by the upper end portion 6 a of theoutlet grille 6 and the lower edge 31 a of the flange portion 31 in theheight direction, which is also referred to as the direction of thearrow Z, and the main roof portion 71 is therefore more stably held.Since the main roof portion 71 is more stably held, a vibration soundcaused when the roof part 7 is wobbled is also prevented.

The roof part 7 also has the extension ribs 73, which each extend fromportions of the tail end 71 e of the main roof portion 71 toward thefront panel 1. In a state in which the outlet grille 6 is fixed to thecasing 100 a, the extension ribs 73 are pressed against the front panel1. With this configuration, a portion of the roof part 7 that is invicinity of the front panel 1 is provided with a portion at which theroof part 7 is in contact with the front panel 1 and a portion at whichthe roof part 7 is not in contact with the front panel 1. With highpressure applied on the portion at which the roof part 7 is in contactwith the front panel 1, the roof part 7 is therefore more stably held.Since the main roof portion 71 is more stably held, a vibration soundcaused when the roof part 7 is wobbled is also prevented.

Also, the main roof portion 71 is inclined further downward as the mainroof portion 71 is further away from the front panel 1. The main roofportion 71 has the horizontal width, which is larger than or equal to anopening-hole diameter, which is also referred to as the diameter Do, ofthe opening hole 1 a in the front panel 1. The roof part 7 also has thefront-end protrusion 74 provided at the front end 71 f of the main roofportion 71 and shaped such that the front-end protrusion 74 protrudesupward. With this configuration, water that flows forward on the topface 71 a of the main roof portion 71 is blocked by the front-endprotrusion 74 and is made flow in the horizontal width direction, whichis also referred to as the direction of the arrow X, and then isdischarged from both opposite ends of the main roof portion 71 in thehorizontal width direction. Drainage from the front is thus prevented.The blocked water is thus also made flow away from the opening hole 1 ain the horizontal width direction, which is also referred to as thedirection of the arrow X, and is then discharged. Water is thereforeprevented from flowing into the opening hole 1 a.

Also, the top face 71 a of the main roof portion 71 is inclined downwardfrom the center Pc in the horizontal width direction, which is alsoreferred to as the direction of the arrow X, toward both the endportions Pe in the horizontal width direction. With this configuration,water on the top face 71 a of the main roof portion 71 is moved towardthe left or right end portion Pe and is sped up by gravity. The water istherefore prevented from stagnating on the main roof portion 71 and thewater on the roof part 7 is thus discharged from at least either one ofthe end portions Pe with more certainty.

The outlet grille 6 also has the grille body 61, which is the pluralityof iron bars 60, the grille extension portions 62, and the fixationportions 63. The grille extension portions 62 are located at respectiveleft and right upper ends of the grille body 61. The grille extensionportions 62 each extend further rearward than the upper end portion 6 aof the outlet grille 6. The fixation portions 63 are located atrespective left and right lower ends of the grille body 61. The fixationportions 63 are fixed to the front panel 1 by the fixing screws 9. Also,at portions above the outer circumference of the opening hole 1 a, theinsertion holes 11 through which the grille extension portions 62 areinserted, are opened in the front panel 1.

With this configuration, when the outlet grille 6 is fixed to the frontpanel 1, the grille extension portions 62 are inserted into theinsertion holes 11. The outlet grille 6 is thus positioned to the frontpanel 1 and fastening the fixing screws 9 is hence facilitated.

Also, the front panel 1 has the bell mouth 1 b, which protrudes from theedge of the opening hole 1 a in the front panel 1 rearward and towardthe center of the opening hole 1 a. With this configuration, also in acase in which the bell mouth 1 b is located at the edge of the openinghole 1 a in the front panel 1, water is prevented from flowing throughbetween the fan 15 a and the bell mouth 1 b. Also, since water isprevented from flowing through the inside, even when the outdoor airtemperature is low, water is prevented from being frozen between the fan15 a and the bell mouth 1 b. Such less resultant ice is less likely tointerfere with a rotation of the fan 15 a and extraordinary noise, whichmay be caused by such interference, is thus prevented from beinggenerated.

The configuration of the outdoor unit 100 for an air-conditioningapparatus is not limited to the embodiments described above, and theconfiguration may be modified or partly omitted as needed. In theexample illustrated in FIG. 15 , the main roof portion 71 is inclinedand extends downward from the front panel 1. Alternatively, for example,the main roof portion 71 may extend from the front panel 1 horizontallyforward. In addition, the lower edge 31 a of the flange portion 31 andthe top face 71 a of the main roof portion 71 are not strictly requiredto be in contact with each other. As long as water is prevented fromflowing around rearward of the lower edge 31 a of the flange portion 31,a gap may be left, to some extent, between the lower edge 31 a of theflange portion 31 and the top face 71 a of the main roof portion 71.

REFERENCE SIGNS LIST

-   -   1: front panel, 1 a: opening hole, 1 b: bell mouth, 1 c: screw        hole, 2, 2 a, 2 b: side panel, 3: top plate, 4: base, 6: outlet        grille, 6 a: upper end portion, 7: roof part, 7 a: recession, 7        b: notch, 8: controller, 9: fixing screw, 10: partition plate,        11: insertion hole, 11 a: rear wall, 11 b: side wall, 11 c: edge        portion, 12: insertion space, 12 a: rear wall, 13: heat        exchanger, 14: support portion, 15: air-sending device, 15 a:        fan, 15 b: motor, 16: compressor, 30: top-plate extension        portion, 31: flange portion, 31 a: lower edge, 60: iron bar, 60        a: vertical bar, 60 b: horizontal bar, 61: grille body, 62:        grille extension portion, 62 a: proximal portion, 62 b:        insertion distal portion, 63: fixation portion, 63 a: screw        hole, 71: main roof portion, 71 a: top face, 71 b: bottom face,        71 e: tail end, 71 f: front end, 72: sub-roof portion, 72 a:        second protrusion, 72 b: first protrusion, 73: extension rib,        74: front-end protrusion, 75: tail-end protrusion, 76:        regulation rib, 100: outdoor unit, 100 a: casing, A: arrow, B:        arrow, Do: diameter, F: air-sending chamber, M: machine chamber,        Pc: center, Pd: bifurcation point, Pe: end portion

1. An outdoor unit for an air-conditioning apparatus, the outdoor unit comprising: a casing that has a front panel in which an opening hole is opened; a fan provided to the casing and configured to blow out air to an outside through the opening hole; a roof part installed at a front of the front panel and above the opening hole and extending in a width direction of the casing; and an outlet grille fixed to the casing and covering the opening hole, the roof part having a main roof portion that extends further forward than the front panel, and a sub-roof portion that extends downward and forward from the main roof portion and has a recession formed between a bottom face of the main roof portion and the sub-roof portion, the outlet grille being located such that an upper end portion of the outlet grille is in contact with the recession, the front panel and the upper end portion of the outlet grille holding the roof part such that the front panel and the upper end portion of the outlet grille sandwich the roof part, the casing having a top plate provided on top of the front panel, the top plate having a top-plate extension portion that extends further forward than a tail end of the main roof portion and covering a portion of the roof part that is in the vicinity of the front panel, the top-plate extension portion having a flange portion that protrudes downward, a top face of the main roof portion and a lower edge of the flange portion being in contact with each other in a state in which the outlet grille is fixed to the casing.
 2. (canceled)
 3. (canceled)
 4. The outdoor unit for an air-conditioning apparatus of claim 1, wherein, in a state in which the outlet grille is fixed to the casing, the top face of the main roof portion and the lower edge of the flange portion are in contact with each other at a location further forward than a location at which the sub-roof portion branches from the main roof portion.
 5. An outdoor unit for an air-conditioning apparatus, the outdoor unit comprising: a casing that has a front panel in which an opening hole is opened; a fan provided to the casing and configured to blow out air to an outside through the opening hole; a roof part installed at a front of the front panel and above the opening hole and extending in a width direction of the casing; and an outlet grille fixed to the casing and covering the opening hole, the roof part having a main roof portion that extends further forward than the front panel, and a sub-roof portion that extends downward and forward from the main roof portion and has a recession formed between a bottom face of the main roof portion and the sub-roof portion, the outlet grille being located such that an upper end portion of the outlet grille is in contact with the recession, the front panel and the upper end portion of the outlet grille holding the roof part such that the front panel and the upper end portion of the outlet grille sandwich the roof part, the roof part having an extension rib that extends from a portion of a tail end of the main roof portion toward the front panel, in a state in which the outlet grille is fixed to the casing, the extension rib being pressed against the front panel.
 6. The outdoor unit for an air-conditioning apparatus of claim 1, wherein the main roof portion is inclined further downward as the main roof portion is further away from the front panel, the main roof portion has a horizontal width that is larger than or equal to an opening-hole diameter of the opening hole in the front panel, and the roof part has a front-end protrusion provided at a front end of the main roof portion and shaped such that the front-end protrusion protrudes upward.
 7. The outdoor unit for an air-conditioning apparatus of claim 1, wherein a top face of the main roof portion is inclined downward from a center in a horizontal width direction toward both end portions in the horizontal width direction.
 8. The outdoor unit for an air-conditioning apparatus of claim 1, wherein the outlet grille has a grille body that is a plurality of iron bars, grille extension portions provided at respective left and right upper ends of the grille body, the grille extension portions each extending further rearward than the upper end portion of the outlet grille, and fixation portions provided at respective left and right lower ends of the grille body, the fixation portions being fixed to the front panel by screws, and, at portions above an outer circumference of the opening hole, insertion holes through which the grille extension portions are inserted are opened in the front panel.
 9. The outdoor unit for an air-conditioning apparatus of claim 1, wherein the front panel has a bell mouth that protrudes, from an edge of the opening hole in the front panel, rearward and toward a center of the opening hole. 